RMLD232UAW datasheet(20/50 Pages) EMLSI

20 / 50 page

Rev 0.7

64Mb Low Power DDR SDRAM

Advanced

Read with Auto Precharge

If a read with auto-precharge command is issued, the DDR SDRAM automatically enters the precharge operation BL/2 clock later

from a read with auto-precharge command when tRAS(min) is satisfied. If not, the start point of precharge operation will be delayed

until tRAS(min) is satisfied. Once the precharge operation has started, the bank cannot be reactivated and the new command can not

be asserted until the precharge time(tRP) has been satisfied.

*NOTE :

1. The row active command of the precharge bank can be issued after tRP from this point.

The new read/write command of other activated bank can be issued from this point.

At burst read/write with auto precharge, CAS interrupt of the same bank is illegal.

NOP

READ A

NOP

DQS

DQs

Figure.14 Read with auto precharge timing

NOP

BANK A

NOP

ACTIVE

Auto Precharge

Dout 0 Dout 1 Dout 2 Dout 3

tRP

*Bank can be reactivated at

completion of tRP

Auto-Precharge starts*1

tRAS(min)

CAS Latency=3

< Burst Length=4, CAS Latency=3 >

Command

RMLD232UAW Datasheet(PDF) 20 Page - Emerging Memory & Logic Solutions Inc